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|Creatures|| Carboniferous Arachnid|
|Time||359 million years ago - 299 million years ago|
|Anomalies||London Underground Anomaly|
|Part of||Palaeozoic era|
|Preceded by||Devonian period|
|Followed by||Permian period|
The Carboniferous was a period in Earth's history, lasting from 359.2 to 299 million years ago. It was filled with swamps and rainforests, where giant insects and amphibians lived and thrived. The Carboniferous was also the birth time of reptiles, and the atmosphere was very hot and had much higher oxygen levels than the present.
An Anomaly to the Carboniferous opened in the London Underground in the present, and a colony of Carboniferous Arachnids and one Arthropleura came through. The Arthropleura was killed via electrocution, and the Arachnids were driven back through the Anomaly using light from torches.
An Arthropleura was captured for use in Oliver Leek's creature army, likely from the London Underground Anomaly. It was presumably killed when the creatures were locked in the Creature Prison's cage room and destroyed each other.